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5 May, 23:53

In the equation Ca (s) + 2H2O (l) - ->Ca (OH) 2 (aq) + H2 (g), list each element used as a reactant, and tell how many atoms of each are needed for this reaction.

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  1. 6 May, 01:23
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    See below

    Explanation:

    Ca + 2H2O → Ca (OH) 2 + H2

    The elements involved are:

    Ca - calcium H - hydrogen O - oxygen

    The numbers of each atom are:

    1 atom Ca 4 atoms H 2 atoms O

    The 2 in front of H2O multiplies everything in the H2O.
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